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The most common site for arterial monitoring is the radial artery, followed by the ulnar.

The least recommended site is the axillary artery.

The dorsalis pedis artery should not be used in diabetics or those who have peripheral vascular disease.

The axillary artery can be difficult to cannulate in an awake patient but if the patient is anesthestized, then one usually requires a long cannula. However, in a heparinized patient, the risk of a hematoma is also significant.